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Pension and Other Post-retirement Benefits (Detail) - Changes in the fair value of the pension plan`s level 3 assets (Fair Value, Inputs, Level 3 [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Pension plan assets at fair value	$ 15,062	$ 16,221
Group Annuity Contract [Member]
Pension plan assets at fair value	15,062	16,221	15,999
Interest income	790	877
Realized gains/(losses)	236	243
Purchases, sales, issuances and settlements, net	$ (2,185)	$ (898)

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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